A large single crystal of TPAF-AlPO4-5 molecular sieve was synthesized by hydrothermal crystallization in the presence of ammonium fluoride. Starting material composition was · 1 P2O5 · 1 Al2O3 · 2. 2 T...A large single crystal of TPAF-AlPO4-5 molecular sieve was synthesized by hydrothermal crystallization in the presence of ammonium fluoride. Starting material composition was · 1 P2O5 · 1 Al2O3 · 2. 2 TPAOH · 1. 7 NH4F ·318 H2O. The crystal size has a hexagonal prism with 80μm across and 500μm length.The structure of tetrapropylarnmonium fluoride - aluminium phosphate type-5 was investigated with X-ray diffraction. The unit cell composition is 12AlPO4 · TPAF, space group P6cc (a= 13. 740(5), c= 8. 474(4) A ). Average bond distances are: P-O 1. 564A and Al-O 1. 640A ,which may be due to the partial disorder of the arrangement of P, Al in the framework. The angles of O-T-O and T-O-T (T?P, Al) are 102-116° and 148-176°, respectively. Residue electron density was not well enough defined to give a precise position for tetrapropylammonium fluoride (TPAF). The template agent, TPA+ cations, situate in the 12-ring channels and F- anions locate in double 4-rings near the 12-ring channels. Fixing atomic positions for the TPAF reduced the unweighted and weighted R, R, from 0. 063 and 0. 082 to 0. 046 and 0. 042,respectively.展开更多
采用化学还原法,制备出了Ni Co B/SAPO-5硝基苯液相加氢制备出对氨基苯酚(PAP)双功能催化剂,利用X射线衍射、扫描电子显微镜等手段表征了催化剂的物化性能。结果表明,非晶态Ni Co B合金以纳米颗粒形式分散在SAPO-5分子筛微球表面;SAPO-5...采用化学还原法,制备出了Ni Co B/SAPO-5硝基苯液相加氢制备出对氨基苯酚(PAP)双功能催化剂,利用X射线衍射、扫描电子显微镜等手段表征了催化剂的物化性能。结果表明,非晶态Ni Co B合金以纳米颗粒形式分散在SAPO-5分子筛微球表面;SAPO-5中n(Si O2)/n(Al2O3)为0.1,Ni负载量为2%,n(Co)/n(Co+Ni)为1时,Ni Co B/SAPO-5双功能催化剂的催化性能较好,硝基苯转化率为90.04%,PAP选择性为42.53%。展开更多
文摘A large single crystal of TPAF-AlPO4-5 molecular sieve was synthesized by hydrothermal crystallization in the presence of ammonium fluoride. Starting material composition was · 1 P2O5 · 1 Al2O3 · 2. 2 TPAOH · 1. 7 NH4F ·318 H2O. The crystal size has a hexagonal prism with 80μm across and 500μm length.The structure of tetrapropylarnmonium fluoride - aluminium phosphate type-5 was investigated with X-ray diffraction. The unit cell composition is 12AlPO4 · TPAF, space group P6cc (a= 13. 740(5), c= 8. 474(4) A ). Average bond distances are: P-O 1. 564A and Al-O 1. 640A ,which may be due to the partial disorder of the arrangement of P, Al in the framework. The angles of O-T-O and T-O-T (T?P, Al) are 102-116° and 148-176°, respectively. Residue electron density was not well enough defined to give a precise position for tetrapropylammonium fluoride (TPAF). The template agent, TPA+ cations, situate in the 12-ring channels and F- anions locate in double 4-rings near the 12-ring channels. Fixing atomic positions for the TPAF reduced the unweighted and weighted R, R, from 0. 063 and 0. 082 to 0. 046 and 0. 042,respectively.
文摘采用化学还原法,制备出了Ni Co B/SAPO-5硝基苯液相加氢制备出对氨基苯酚(PAP)双功能催化剂,利用X射线衍射、扫描电子显微镜等手段表征了催化剂的物化性能。结果表明,非晶态Ni Co B合金以纳米颗粒形式分散在SAPO-5分子筛微球表面;SAPO-5中n(Si O2)/n(Al2O3)为0.1,Ni负载量为2%,n(Co)/n(Co+Ni)为1时,Ni Co B/SAPO-5双功能催化剂的催化性能较好,硝基苯转化率为90.04%,PAP选择性为42.53%。
